python多线程案例之多任务copy文件完整实例

import os
import multiprocessing
def copy_file(q,file_name, old_folder_name, new_folder_name):
  """完成文件的复制"""
  old_f = open(old_folder_name+"/"+file_name, "rb")
  content = old_f.read()
  old_f.close()
  new_f = open(new_folder_name+"/"+file_name, "wb")
  new_f.write(content)
  new_f.close()
  # print("从%s--->到%s 复制文件%s成功！" % (old_folder_name, new_folder_name, file_name))
  q.put(file_name)
def main():
  # 1.获取用户要copy的文件夹名称
  old_folder_name = input("请输入要copy的文件夹：")
  # 2.创建一个新的文件夹
  try:
    new_folder_name = old_folder_name + "复件"
    os.mkdir(new_folder_name)
  except:
    pass
  # 3.获取所有待copy的文件名称 listdir()
  file_names = os.listdir(old_folder_name)
  print(file_names)
  # 4.创建进程池
  po = multiprocessing.Pool(2)
  # 5.创建一个队列
  q = multiprocessing.Manager().Queue()
  # 6.向进程池中添加copy文件的任务
  for file_name in file_names:
    po.apply_async(copy_file, args=(q,file_name, old_folder_name, new_folder_name))
  po.close()
  # po.join()
  all_file_num = len(file_names) # 统计所有的文件个数
  copy_ok_num = 0
  while True:
    file_name = q.get()
    # print("已经完成copy ：%s" % file_name)
    copy_ok_num += 1
    print("\r复制的进度为：%.2f %%" % (copy_ok_num*100/all_file_num),end='')
    if copy_ok_num >= all_file_num:
      break
if __name__ == '__main__':
  main()